A cast from an external mould in a concretion, of a very fine adult, probably almost complete, showing one side and the venter. It shows the smooth inner whorls, the following dense wiry ribbing and the crenelated keel in good detail. The umbilical seam uncoils over the last 1/3 whorl and continues for a further 12mm. From a concretion in glacial drift, Novaya Zemlya, former USSR.
Size: 63 mm on a block 75 mm
Size: 63 mm on a block 75 mm